perf(agent): 为历史对话项添加 key 属性

- 在 history-item 组件中添加 :key="index"，以优化渲染性能

src/views/agent/work-flow/components/DynamicForm.vue

@@ -21,6 +21,9 @@
           v-model="formData[field.props.name]"
           :placeholder="field?.props?.placeholder"
         />
+        <a-color-picker       v-if="field.type === 'color_picker'"
+                              style="width: 500px; height: 200px"
+                              v-model="formData[field.props.name]" />
         <ImageUpload
           v-if="field.type == 'upload_image'"
           v-model="formData[field.props.name]"